unSigned
Lots of small developers have a hard time navigating Apple's red tape so it requires manually authorizing installs. Users get used to that which makes the notion of signed applications less effective. If Apple were to put in the OS no way to bypass the restrictions, more people might jump to W or linux as lots of development would move elsewhere. I use plenty of the "big" applications, but I find many very niche applications that do one or two things make my life so much easier. A new clipboard utility I just bought has made filing Copyright applications much easier. I used to have to open a text document and save data and application/registration numbers so I could record them and then copy/paste in all of the places the government forms need that information.